===Running a Wideband FDTD Simulation===
Once you build your physical structure in the project workspace and define an excitation source, you are ready to run an FDTD simulation. The simulation engine will run even if you have not defined any observables. Obviously, no simulation data will be generated in that case. EM.Tempo currently offers several different simulation modes as follows(click on each type to learn more about it):
# * Wideband Analysis* '''[[Parametric_Modeling,_Sweep_%26_Optimization# Running_Parametric_Sweep_Simulations_in_EM.Cube | Parametric Sweep]]'''# Dispersion Sweep# * '''[[Parametric_Modeling,_Sweep_%26_Optimization#Optimization | Optimization]]'''* '''[[Building_Reusable_Models# Running_an_HDMR_Sweep | HDMRSweep]]'''* '''[[Modeling_Periodic_Structures#Running_a_Dispersion_Sweep_in_EM.Tempo | Dispersion Sweep]]''' for periodic structures excited using a plane wave source
Analysis is EM.Tempo's simplest and most straightforward simulation mode. It runs the FDTD time marching loop once. At the end of the simulation, the time-domain field data are transformed into the frequency domain using a discrete Fourier transform (DFT). As a result, you can generate wideband frequency data from a single time-domain simulation run. The other simulation modes will be explained later in this manual.